I've made a smart contract for the Qtum Sparknet testnet. It functions as a basic faucet. It doesn't help if you don't already have some coins because gas is required to use it. However, if you need more coins you can use this faucet to retrieve 100 coins at a time. You can also use it to send coins to other addresses not owned by you.

Now we face a problem. Solidity doesn't actually use base58 addresses, it uses hex addresses like in Ethereum. This includes the ABI data as well. We must first convert our base58 address QUvMQdxMxUuCQ7zLHvAcfmhFWyP9kkjr8C to a hex address. A recent update to Qtum has added two RPC calls for this purpose: gethexaddress and fromhexaddress.

What this does is actually takes the data encoded in the base58 address, validates that it is not corrupted and is the right size, and then will return that data as a hex string. This hex string is the address format that Solidity and thus the ABI uses. So, now we fix our mistake:

Under execution result, the gasUsed field is what we are interested in. It's always safer to send a little more gas than is needed to avoid out of gas exceptions. So, we will use 60,000 for the gas limit.

This contract is still alive and I'll monitor it and put more coins into it. So join in on the fun and deposit some coins and withdraw them. It's a pretty cool little contract that I made in about 10 minutes.